export interface RetryOptions {
    /**
     * The maximum amount of times to retry the operation. Default is 10.
     */
    retries?: number;
    /**
     * The exponential factor to use. Default is 2.
     */
    factor?: number;
    /**
     * Initial delay in milliseconds between retries. Default is 1000.
     */
    minTimeout?: number;
    /**
     * Maximum delay in milliseconds between retries. Default is 30000.
     */
    maxTimeout?: number;
    /**
     * Custom delay callback returning delay in milliseconds for attempt N.
     */
    delay?: (attempt: number) => number;
}
export declare function retry<T = void>(fn: (retryCount: number, attempt: number) => Promise<T>, options?: RetryOptions): Promise<T>;
export interface TimeEndFunction {
    /**
     * @returns Elapsed milliseconds.
     */
    (): number;
    /**
     * @returns Elapsed milliseconds rounded.
     */
    rounded(): number;
    /**
     * @returns Elapsed seconds.
     */
    seconds(): number;
    /**
     * @returns Elapsed nanoseconds.
     */
    nanoseconds(): bigint;
}
/**
 * Returns a function that can be used to measure the time elapsed
 * since the function was called.
 */
export declare function timeSpan(): TimeEndFunction;